RAM performance has a pretty minimal impact on Terragen render performance *in general*. And the only things that ultimately should have any effect at all (however small) are bandwidth (generally indicated roughly by clock speed in Mhz, given you're comparing with the same *type* of memory, e.g. DDR2, and not comparing that with DDR3 for example), and latency, with the latter having a vanishly small impact that is probably all but imeasurable with the other variables involved (e.g. CPU speed, background tasks, etc.). Memory *speed* is probably one of the last factors you want to worry about when trying to optimize your hardware for Terragen performance.
All that is to say, then, that as long as the clock speed and timings (latency) of the memory you are considering are the same, the performance should also be the same. Having *more* memory will help a lot though, not necessarily in performance (although with more complex scenes it *can* have a notable impact, especially when your computer otherwise has to swap to disk), but certainly with the ability you have to make complex scenes.
- Oshyan
